No Brown leaves (anywhere) are accepted, even the smallest parts with brown will be rejected

They are looking only for leaves from New England and the first step after collecting the leaves you think they will like/buy is to take pictures and send them for approval. Email your pictures to Cash4Leaves@gmail.com. They promise to get back to you within 12 hours. There are also restrictions on their packaging once you are ready to send the leaves. See all the details here.

The leaves are then sold at Ship Foliage. Seriously you can't make this stuff up.